/usr/share/octave/packages/financial-0.5.0/sdeld.m is in octave-financial 0.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | ## Copyright (C) 2016 Parsiad Azimzadeh <parsiad.azimzadeh@gmail.com>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU Lesser General Public License as published by the Free
## Software Foundation; either version 3 of the License, or (at your option) any
## later version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
## for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{SDE} =} sdeld (@var{A}, @var{B}, @var{Alpha}, @var{Sigma})
## @deftypefnx {Function File} {@var{SDE} =} sdeld (@var{A}, @var{B}, @var{Alpha}, @var{Sigma}, @var{OptionName}, @var{OptionValue}, @dots{})
## Creates an object to represent a stochastic differential equation (SDE) in
## linear drift-rate form:
##
## @center dX_t = (@var{A}(t) + @var{B}(t) * X_t)dt + (diag(X_t.^@var{Alpha}(t)) * @var{Sigma}(t))dW_t
##
## @itemize @bullet
## @item (X_t) is an NVARS-dimensional process;
## @item (W_t) is an NBROWNS-dimensional Wiener process.
## @end itemize
##
## The parameters @var{A} and @var{B} appear in the @@sde/drift documentation.
##
## The parameters @var{Alpha} and @var{Sigma} appear in the @@sde/diffusion
## documentation.
##
## See the @@sde documentation for a list of optional arguments.
##
## @seealso{drift, diffusion, sde}
## @end deftypefn
function SDE = sdeld (A, B, Alpha, Sigma, varargin)
if (nargin < 4)
print_usage ();
endif
Drift = drift (A, B);
Diffusion = diffusion (Alpha, Sigma);
SDE = sde (Drift, Diffusion, varargin{:});
endfunction
|